Bonding Strength of DLC Film on Zirconia Coating Prepared by Gas Tunnel Type Plasma Spraying

Kobayashi, Akira; Zhang, Jialiang; Yatsuzuka, Mitsuyasu

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タイトル	Bonding Strength of DLC Film on Zirconia Coating Prepared by Gas Tunnel Type Plasma Spraying
著者	Kobayashi, Akira Kobayashi, Akira
	Zhang, Jialiang Zhang, Jialiang
	Yatsuzuka, Mitsuyasu Yatsuzuka, Mitsuyasu
キーワード等	DLC Film on ZrO₂ Coating
	Scratch Test
	Adhesion Strength
	Gas Tunnel Type Plasma Spraying
抄録	Plasma sprayed zirconia coatings are now commonly used as the thermal barrier coatings (TBC) for high-temperature parts in many mechanical applications such as the engines of automobiles, planes and rockets. However, coating adhesion is frequently the cause for the failure of the coatings. As the same as the zirconia coatings, the deposition of diamond-like carbon (DLC) films on the metal substrate has some problem in the adhesion between DLC film and the substrate. But the adhesion property was improved by the interlayer of a hard ceramic coating on the metal substrate. In order to show the failure mechanism for coating adhesion, zirconia coatings with different thickness were prepared on stainless steel and/or aluminum substrates by a novel kind of gas tunnel type plasma spraying. The as-sprayed coatings were firstly polished and then subjected to deposition of diamond-like carbon (DLC) films using hydrocarbon gas as the carbon source. The adhesion of the DLC covered zirconi coatings was evaluated by the scratch test method. The evaluation showed that thicker as-sprayed zirconia coatings on aluminum alloy substrate showed much higher scratch durability, even with thinner zirconia coatings. The porosity and hardness of as-sprayed coatings were measured on the coating cross-sections using a micro-hardness tester and optical microscopy. The results showed that thicker coatings had higher hardness and lower porosity. The adhesion failure of DLC films on zirconia coatings is caused by two different mechanisms: one is the separation of the DLC films from the zirconia coatings and the other is the breaking of the DLC films under stress load because of the brittleness of the material. From the microscopic photos of the scratch tracks, the adhesion failure of DLC film on the thinner zirconia coatings is due to the flaking of DLC film by the distortion of aluminum alloy substrate, while the adhesion failure of DLC films on thicker zirconia coating is due to the chipping of the DLC film itself.
公開者	大阪大学接合科学研究所
公開者の別表記	Joining and Welding Research Institute, Osaka University
公開者 (ヨミ)	オオサカダイガクセツゴウカガクケンキュウジョ
掲載誌名	Transactions of JWRI
巻	35
号	2
開始ページ	29
終了ページ	34
刊行年月	2006-12
ISSN	03874508
NCID	AA00867058
URL	http://hdl.handle.net/11094/6964
言語	英語
カテゴリ	紀要論文 Departmental Bulletin Paper
カテゴリ	Transactions of JWRI / Vol.35 No.2 (2006-12)

著者版フラグ	publisher
NII資源タイプ	紀要論文
ローカル資源タイプ	紀要論文
dcmi資源タイプ	text
DCTERMS.bibliographicCitation	Transactions of JWRI.35(2) P.29-P.34
DC.title	Bonding Strength of DLC Film on Zirconia Coating Prepared by Gas Tunnel Type Plasma Spraying
DC.creator	Kobayashi, Akira
	Zhang, Jialiang
	Yatsuzuka, Mitsuyasu
DC.publisher	大阪大学接合科学研究所
DC.language" scheme="DCTERMS.RFC1766	英語
DCTERMS.issued" scheme="DCTERMS.W3CDTF	2006-12
DC.identifier" scheme="DCTERMS.URI	http://hdl.handle.net/11094/6964
DC.subject	DLC Film on ZrO₂ Coating
	Scratch Test
	Adhesion Strength
	Gas Tunnel Type Plasma Spraying
DCTERMS.abstract	Plasma sprayed zirconia coatings are now commonly used as the thermal barrier coatings (TBC) for high-temperature parts in many mechanical applications such as the engines of automobiles, planes and rockets. However, coating adhesion is frequently the cause for the failure of the coatings. As the same as the zirconia coatings, the deposition of diamond-like carbon (DLC) films on the metal substrate has some problem in the adhesion between DLC film and the substrate. But the adhesion property was improved by the interlayer of a hard ceramic coating on the metal substrate. In order to show the failure mechanism for coating adhesion, zirconia coatings with different thickness were prepared on stainless steel and/or aluminum substrates by a novel kind of gas tunnel type plasma spraying. The as-sprayed coatings were firstly polished and then subjected to deposition of diamond-like carbon (DLC) films using hydrocarbon gas as the carbon source. The adhesion of the DLC covered zirconi coatings was evaluated by the scratch test method. The evaluation showed that thicker as-sprayed zirconia coatings on aluminum alloy substrate showed much higher scratch durability, even with thinner zirconia coatings. The porosity and hardness of as-sprayed coatings were measured on the coating cross-sections using a micro-hardness tester and optical microscopy. The results showed that thicker coatings had higher hardness and lower porosity. The adhesion failure of DLC films on zirconia coatings is caused by two different mechanisms: one is the separation of the DLC films from the zirconia coatings and the other is the breaking of the DLC films under stress load because of the brittleness of the material. From the microscopic photos of the scratch tracks, the adhesion failure of DLC film on the thinner zirconia coatings is due to the flaking of DLC film by the distortion of aluminum alloy substrate, while the adhesion failure of DLC films on thicker zirconia coating is due to the chipping of the DLC film itself.
citation_title	Bonding Strength of DLC Film on Zirconia Coating Prepared by Gas Tunnel Type Plasma Spraying
citation_author	Kobayashi, Akira
	Zhang, Jialiang
	Yatsuzuka, Mitsuyasu
citation_publisher	大阪大学接合科学研究所
citation_language	英語
citation_date	2006-12
citation_journal_title	Transactions of JWRI
citation_volume	35
citation_issue	2
citation_firstpage	29
citation_lastpage	34
citation_issn	03874508
citation_public_url	http://hdl.handle.net/11094/6964
citation_keywords	DLC Film on ZrO₂ Coating
	Scratch Test
	Adhesion Strength
	Gas Tunnel Type Plasma Spraying

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